Answer the questions

1. What are gates used for?

2. What types of gates are there?

3. What do the flashboard gates consist of?

4. When are the flashboard gates removed?

5. What do stop logs consist of?

6. What are stop logs used for?

7. What do needles consist of?

8. Are needles quite difficult to place in flowing water?

9. Where are needles used for?

10. Why must outlet works be provided?

11. Why must all outlet works be provided with gates or valves?

12. What is a sluiceway?

13. What do the outlets of most dams consist of?

14. When are several sluiceways required?

15. May sluiceways be polygonal in shape?

16. What should the interior of sluiceways be?

17. What is also important for sluiceways?

Finish the following sentences.

1. The spillway crest can be obtained....

2. The flashboard gates consist of....

3. The logs may be....

4. Stop logs are ordinarily used for....

5. There are some other types of gates, such as....

6. The water may be discharged into....

7. Considerable attention should be given to....